Fitness is not only for your fitness instructor to instruct; you should listen to a doctor too.
The reason is that you could do damage to your body by overstretching muscles and tendons, or shedding too much fat. This certainly is detrimental.
You can shed your excess weight in a lot of ways.
The gym, the spa, acupuncture, or even hypnosis. As far as you are concerned, you get to look and feel healthy.
But the question is: are you willing to get up and move towards losing weight? Only you can really answer that question.